This philosopher's dissertation explained four classes, three of which are "Becoming," "Knowing," and "Being." This man argued that neither theistic commandments nor categorical imperatives will bring human beings to behave morally and that humans must cultivate their natural tendency for compassion in his On the Basis of Morality. This thinker posits that humans perceive their bodies by means of the two title concepts, which only differ due to human perspective. For 10 
This philosopher's dissertation explained four classes, three of which are "Becoming," "Knowing," and "Being." This man argued that neither theistic commandments nor categorical imperatives will bring human beings to behave morally and that humans must cultivate their natural tendency for compassion in his On the Basis of Morality. This thinker posits that humans perceive their bodies by means of the two title concepts, which only differ due to human perspective. For 10 points, name this philosopher who introduced the concept of the "thing-in-itself" to correct Immanuel Kant's metaphysics in his work The World as Will and Representation.
This philosopher's dissertation explained four classes, three of which are "Becoming," "Knowing," and "Being.
Arthur {Schopenhauer}